Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

The problem with those clips is that you are also feeding the (5or3) volts to the whole main board, and the usb port usually can't supply the current. The voltage from the clip is also connected to the cpu, memory, etc. not just the spi/eeprom chip

I have removed the chip from the board and it worked.

Sadly, I have damaged the pads on the boards when I removed it. I have used the hot air gun, done some practice on a scrap board, set to 280C, all fine.
When I moved onto the actual board, the chip would not come off like the solder wasn't melting. After increasing the temperature a little bit (320C) and keeping the air gun on it for longer time it eventually came off but also the pads and traces.

It was a good experience and I think I need to practice more. Looking forward
to the next project.

Thanks everyone for help!

[R_J]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

Good point, I didn’t think that far.

Would it be possible to write the chip while the board is installed and the TV is on? This way it will be powered from TV’s PSU but not sure if it’s safe to read/write data?

I don't think that would work. It would be easier to remove the ic. I have use a zif adaptor for these ic's

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

The problem with those clips is that you are also feeding the (5or3) volts to the whole main board, and the usb port usually can't supply the current. The voltage from the clip is also connected to the cpu, memory, etc. not just the spi/eeprom chip

Good point, I didn't think that far.

Would it be possible to write the chip while the board is installed and the TV is on? This way it will be powered from TV's PSU but not sure if it's safe to read/write data?

[R_J]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

The problem with those clips is that you are also feeding the (5or3) volts to the whole main board, and the usb port usually can't supply the current. The voltage from the clip is also connected to the cpu, memory, etc. not just the spi/eeprom chip

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

It is written directly on the board.

I've received the programmer today and I bumped into another grey area.
When the clip is not connected to the chip, the programmer's status is "Connected" and the red LED light on it is on.

When I connect the clip to the chip, the programmer disconnects and the red LED light goes off. Also, some components next to the USB connector seem to get really hot.

It happens on both bad and good board. It seems to be a shot-circuit or a low resistor that's causing that.

Is any way around without de-soldering the chip? I don't have any tools though.

[yokoono]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

It is written directly on the board.

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

To repair the old motherboard you will need something like this (CH341A). It's cheap.

Do I have to remove the chip from the board or can I program on board?
Sorry, never done chip programming before.

[yokoono]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

To repair the old motherboard you will need something like this (CH341A). It's cheap.

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

You said the remote DOES NOT WORK on original board so how will that work??

That's right, the remote doesn't work on original board with the none of the firmware I've tried so far.
I just didn't know I need it for this procedure, I imagined it would work just by pressing OK.
Now I understand they are two different things.

[nomoresonys]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

You said the remote DOES NOT WORK on original board so how will that work??

[yokoono]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

Files saved from TV (profiles) cannot be uploaded to TV as a firmware. A folder called Profiles is created on the stick in which the saved files are placed. Another empty folder is created called "downloadprofile.mb130". They are put on the stick. Starting TV, inserting stick into usb, MENU 4725, usb operation. But on the old board the remote control doesn't work. So you cannot access MENU.

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

What you say is correct. You want to copy the profile from the good TV to the stick. You want to rewrite the profile on the defective board. So far it's good. But to write the profile on the defective board you have to enter menu 4725 but the remote control does NOT work on the defective board. The only chance is to write SPI memory directly (FLASH).

I thought it will work the same way as the firmware you gave me earlier. Plug the USB into defective board, press OK on remote, power up and the software upgrade process will start.
Do I miss something here?

[yokoono]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

What you say is correct. You want to copy the profile from the good TV to the stick. You want to rewrite the profile on the defective board. So far it's good. But to write the profile on the defective board you have to enter menu 4725 but the remote control does NOT work on the defective board. The only chance is to write SPI memory directly (FLASH).

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

In the service menu enter the sequence MENU + 4 + 7 + 2 + 5. On the defective plate you cannot use this sequence because the remote control does not work. So for the repair I have to use a programmer (CH341A). With it you can directly rewrite the SPI memory.

What I was thinking (if possible) was this:
- enter service menu on the good board
- download a copy of the firmware on USB stick
- put the defective board into tv
- upgrade firmware with the USB stick

Is that how it works?

[yokoono]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

In the service menu enter the sequence MENU + 4 + 7 + 2 + 5. On the defective plate you cannot use this sequence because the remote control does not work. So for the repair I have to use a programmer (CH341A). With it you can directly rewrite the SPI memory.

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

Copy the contents of the SPI U115 memory (MX25L512) from a good main with a programmer and rewrite the memory from the bad main.

Can it not be dumped via tv menu?
Is there any way to access service menu?

[yokoono]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

Copy the contents of the SPI U115 memory (MX25L512) from a good main with a programmer and rewrite the memory from the bad main.

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

I've ordered a replacement board from fleaBay and it fixed the tv.

This is the software installed on it, see attached picture.

Is there any possibility to copy the firmware from the replacement board onto the original board?
It's a shame to throw it away just because it hasn't got the right software.

[ducky29]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

This is a JVC firmware but is behaving the same as the previous Toshiba.
It upgrades, I get the initial setup screen but the remote control does not work.

The white band at the bottom of the screen disappears when I push up the jog on the tv but that's it, nothing else seems to happen.

JVC needs a different remote.

[geo86]

Re: Tv Digihome 50292UHDDLEDCNTD restarts and blinking standby light

If the OK key on the remote control is not functional, you cannot update the stick. If the OK key is functional you have a software here But I don't know if it will fit the panel.
https://files.fm/u/qh8skpyu

This is a JVC firmware but is behaving the same as the previous Toshiba.
It upgrades, I get the initial setup screen but the remote control does not work.

The white band at the bottom of the screen disappears when I push up the jog on the tv but that's it, nothing else seems to happen.